Immunization rates of preschool children in the United States are well below recommended levels.

Whereas low-income and minority groups have been targeted as at risk for inadequate immunization, the assumption is generally made that middle/upper-income children are adequately immunized through the private sector.

We conducted a community-based survey that refutes this assumption.

Only 31 ; of the 302 parents surveyed reported full immunization of their 2-year-olds.

No significant differences were found in the immunization rates for middle/upper-income (34 ; immunized) versus lower-income children (28 ; immunized).

Failure to receive the 18-month doses of DTP and polio was the most frequent cause of inadequate coverage for both groups.